package com.sky.service.impl;

import com.alibaba.fastjson.JSON;
import com.alibaba.fastjson.JSONObject;
import com.github.pagehelper.Page;
import com.github.pagehelper.PageHelper;
import com.github.xiaoymin.knife4j.core.util.CollectionUtils;
import com.sky.constant.MessageConstant;
import com.sky.context.BaseContext;
import com.sky.dto.*;
import com.sky.entity.*;
import com.sky.exception.AddressBookBusinessException;
import com.sky.exception.OrderBusinessException;
import com.sky.exception.ShoppingCartBusinessException;
import com.sky.mapper.*;
import com.sky.result.PageResult;
import com.sky.service.OrderService;
import com.sky.utils.WeChatPayUtil;
import com.sky.vo.OrderPaymentVO;
import com.sky.vo.OrderStatisticsVO;
import com.sky.vo.OrderSubmitVO;
import com.sky.vo.OrderVO;
import com.sky.websocket.WebSocketServer;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;

import java.math.BigDecimal;
import java.time.LocalDateTime;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.stream.Collectors;
import java.util.stream.Stream;

@Service
@Slf4j
public class OrderServiceImpl implements OrderService {
    @Autowired
    private UserMapper userMapper;
    @Autowired
    private OrderMapper orderMapper;
    @Autowired
    private OrderDetailMapper orderDetailMapper;
    @Autowired
    private AddressBookMapper addressBookMapper;
    @Autowired
    private ShoppingCartMapper shoppingCartMapper;
    @Autowired
    private WeChatPayUtil weChatPayUtil;
    @Autowired
    private WebSocketServer webSocketServer;

    /**
     * 用户下单
     *
     * @param ordersSubmitDTO
     * @return
     */
    @Transactional
    @Override
    public OrderSubmitVO submitOrder(OrdersSubmitDTO ordersSubmitDTO) {

        //1.处理各种业务异常(地址簿为空，购物车数据为空)
        AddressBook addressBook = addressBookMapper.getById(ordersSubmitDTO.getAddressBookId());
        if (addressBook == null) {
            //抛出业务异常，地址簿为空不能下单
            throw new AddressBookBusinessException(MessageConstant.ADDRESS_BOOK_IS_NULL);
        }

        //查询当前用户的购物车数据
        Long userId = BaseContext.getCurrentId();
        ShoppingCart shoppingCart = new ShoppingCart();
        shoppingCart.setUserId(userId);
        List<ShoppingCart> shoppingCartList = shoppingCartMapper.list(shoppingCart);
        if (shoppingCartList == null || shoppingCartList.size() == 0) {
            //抛出业务异常，购物车数据为空，不能下单
            throw new ShoppingCartBusinessException(MessageConstant.SHOPPING_CART_IS_NULL);
        }

        //2.向订单表插入1条数据
        Orders orders = new Orders();
        BeanUtils.copyProperties(ordersSubmitDTO, orders);
        orders.setOrderTime(LocalDateTime.now());
        orders.setPayStatus(Orders.UN_PAID);
        orders.setStatus(Orders.PENDING_PAYMENT);
        orders.setNumber(String.valueOf(System.currentTimeMillis()));
        orders.setPhone(addressBook.getPhone());
        orders.setConsignee(addressBook.getConsignee());
        orders.setUserId(userId);
        orders.setAddress(addressBook.getDetail());

        orderMapper.insert(orders);

        List<OrderDetail> orderDetailList = new ArrayList<>();

        //3.向订单明细表插入n条数据
        for (ShoppingCart cart : shoppingCartList) {
            OrderDetail orderDetail = new OrderDetail();//订单明细对象
            BeanUtils.copyProperties(cart, orderDetail);
            orderDetail.setOrderId(orders.getId());//设置当前订单明细关联的订单id
            orderDetailList.add(orderDetail);
        }

        orderDetailMapper.insertBatch(orderDetailList);

        //4.用户下单成功后清空用户购物车数据
        shoppingCartMapper.deleteByUserId(userId);

        //5.返回封装VO结果
        OrderSubmitVO orderSubmitVO = OrderSubmitVO.builder()
                .id(orders.getId())
                .orderTime(orders.getOrderTime())
                .orderNumber(orders.getNumber())
                .orderAmount(orders.getAmount()).build();
        return orderSubmitVO;
    }


    /**
     * 订单支付
     *
     * @param ordersPaymentDTO
     * @return
     */
    public OrderPaymentVO payment(OrdersPaymentDTO ordersPaymentDTO) throws Exception {
        // 当前登录用户id
        Long userId = BaseContext.getCurrentId();
        User user = userMapper.getById(userId);

        //调用微信支付接口，生成预支付交易单
//        JSONObject jsonObject = weChatPayUtil.pay(
//                ordersPaymentDTO.getOrderNumber(), //商户订单号
//                new BigDecimal(0.01), //支付金额，单位 元
//                "苍穹外卖订单", //商品描述
//                user.getOpenid() //微信用户的openid
//        );
//
//        if (jsonObject.getString("code") != null && jsonObject.getString("code").equals("ORDERPAID")) {
//            throw new OrderBusinessException("该订单已支付");
//        }

        //生成空JSON，跳过微信支付流程
        JSONObject jsonObject = new JSONObject();
        jsonObject.put("code", "ORDERPAID");
        OrderPaymentVO vo = jsonObject.toJavaObject(OrderPaymentVO.class);
        vo.setPackageStr(jsonObject.getString("package"));

        //为替代微信支付成功后的数据库订单状态更新，多定义一个方法进行修改
        Integer orderPaidStatus = Orders.PAID;
        Integer orderStatus = Orders.TO_BE_CONFIRMED;

        //发现没有将支付时间check_out 属性进行赋值，所以在这里进行更新
        LocalDateTime cheack_out_time = LocalDateTime.now();

        //获取订单号码
        String orderNumber = ordersPaymentDTO.getOrderNumber();

        log.info("调用updateStatus方法，用于替换微信支付更新数据库状态的问题");
        orderMapper.updateStatus(orderStatus, orderPaidStatus, cheack_out_time, orderNumber);


        Map map = new HashMap<>();
        map.put("type", 1);//1表示来单提醒 2表示客户催单
        map.put("orderId", ordersPaymentDTO.getOrderNumber());
        map.put("content", "订单号: " + ordersPaymentDTO.getOrderNumber());

        String json = JSON.toJSONString(map);
        webSocketServer.sendToAllClient(json);


        return vo;
    }

    /**
     * 支付成功，修改订单状态
     *
     * @param outTradeNo
     */
    public void paySuccess(String outTradeNo) {

        // 根据订单号查询订单
        Orders ordersDB = orderMapper.getByNumber(outTradeNo);

        // 根据订单id更新订单的状态、支付方式、支付状态、结账时间
        Orders orders = Orders.builder()
                .id(ordersDB.getId())
                .status(Orders.TO_BE_CONFIRMED)
                .payStatus(Orders.PAID)
                .checkoutTime(LocalDateTime.now())
                .build();

        orderMapper.update(orders);

        //由于跳过了微信支付，所以这段代码需要写在payment方法里
        //通过websocket向客户端浏览器推送消息 type orderId content
//        Map map = new HashMap<>();
//        map.put("type",1);//1表示来单提醒 2表示客户催单
//        map.put("orderId",ordersDB.getId());
//        map.put("content","订单号: " + outTradeNo);
//
//        String json = (String) JSON.toJSON(map);
//        webSocketServer.sendToAllClient(json);
    }

    @Override
    public PageResult pageQuery4User(int pageNum, int pageSize, Integer status) {
        //设置分页
        PageHelper.startPage(pageNum, pageSize);

        OrdersPageQueryDTO ordersPageQueryDTO = new OrdersPageQueryDTO();
        ordersPageQueryDTO.setUserId(BaseContext.getCurrentId());
        ordersPageQueryDTO.setStatus(status);

        Page<Orders> page = orderMapper.pageQuery(ordersPageQueryDTO);

        List<OrderVO> list = new ArrayList<>();

        if (page != null && page.getTotal() > 0) {
            for (Orders orders : page) {
                Long orderId = orders.getId();

                List<OrderDetail> orderDetails = orderDetailMapper.getByOrderId(orderId);

                OrderVO orderVO = new OrderVO();
                BeanUtils.copyProperties(orders, orderVO);
                orderVO.setOrderDetailList(orderDetails);

                list.add(orderVO);

            }
        }
        long total = page.getTotal();
        return new PageResult(total, list);
    }

    @Override
    public OrderVO details(Long id) {
        //根据id查询订单
        Orders order = orderMapper.getById(id);

        //查询该订单对应的订单详情
        List<OrderDetail> orderDetails = orderDetailMapper.getByOrderId(order.getId());

        //将其订单及订单详情封装到VO对象当中
        OrderVO orderVO = new OrderVO();
        BeanUtils.copyProperties(order, orderVO);
        orderVO.setOrderDetailList(orderDetails);

        return orderVO;
    }

    /**
     * 用户取消订单
     *
     * @param id
     */
    @Override
    public void userCancelById(Long id) throws Exception {
        //根据id查询订单
        Orders ordersDB = orderMapper.getById(id);
        //校验订单是否存在
        if (ordersDB == null) {
            throw new OrderBusinessException(MessageConstant.ORDER_NOT_FOUND);
        }

        //根据订单状态决定能否取消订单 1待付款 2待接单 3已接单 4派送中 5已完成 6已取消
        if (ordersDB.getStatus() > 2) {
            throw new OrderBusinessException(MessageConstant.ORDER_STATUS_ERROR);
        }

        Orders orders = new Orders();
        orders.setId(ordersDB.getId());
        //如果订单已经是待接单状态下，就需要进行退款操作
        if (ordersDB.getStatus().equals(Orders.TO_BE_CONFIRMED)) {
            //这里因为已经跳过了微信支付，所以并不需要再调用微信支付接口来退款，不然会出现空指针异常
            //调用微信支付接口解决退款问题
//            weChatPayUtil.refund(
//                    ordersDB.getNumber(),//商户订单号
//                    ordersDB.getNumber(),//商户退款单号
//                    new BigDecimal(0.01),//退款金额，单位 元
//                    new BigDecimal(0.01));//原订单金额

            orders.setPayStatus(Orders.CANCELLED);
        }

        //更新订单状态，取消原因，取消时间
        orders.setStatus(Orders.CANCELLED);
        orders.setCancelReason("用户取消了订单");
        orders.setCancelTime(LocalDateTime.now());
        orderMapper.update(orders);
    }

    /**
     * 再来一单功能实现
     * 再来一单就是将原订单中的商品重新加入到购物车中
     *
     * @param id
     */
    @Override
    public void repetition(Long id) {
        //查询当前用户id
        Long userId = BaseContext.getCurrentId();

        //根据订单id查询当前订单详情
        List<OrderDetail> orderDetailList = orderDetailMapper.getByOrderId(id);

        //将订单详情对象转换为购物车对象
        List<ShoppingCart> shoppingCartList = orderDetailList.stream().map(x -> {
            ShoppingCart shoppingCart = new ShoppingCart();

            //将原订单详情中的菜品信息重新复制到购物车对象当中
            BeanUtils.copyProperties(x, shoppingCart, "id");
            shoppingCart.setUserId(userId);
            shoppingCart.setCreateTime(LocalDateTime.now());

            return shoppingCart;
        }).collect(Collectors.toList());

        //将购物车对象批量插入到数据库当中
        shoppingCartMapper.insertBatch(shoppingCartList);


    }

    /**
     * 订单搜索
     *
     * @param ordersPageQueryDTO
     * @return
     */
    @Override
    public PageResult conditionSearch(OrdersPageQueryDTO ordersPageQueryDTO) {
        PageHelper.startPage(ordersPageQueryDTO.getPage(), ordersPageQueryDTO.getPageSize());
        Page<Orders> page = orderMapper.pageQuery(ordersPageQueryDTO);

        // 部分订单状态，需要额外返回订单菜品信息，将Orders转化为OrderVO
        List<OrderVO> orderVOList = getOrderVOList(page);

        return new PageResult(page.getTotal(), orderVOList);

    }

    /**
     * 各状态订单数量统计
     *
     * @return
     */
    @Override
    public OrderStatisticsVO statistics() {
        //根据状态，分别查询出待接单、待配送、派送中的订单数量
        Integer toBeConfirmed = orderMapper.countStatus(Orders.TO_BE_CONFIRMED);
        Integer confirmed = orderMapper.countStatus(Orders.CONFIRMED);
        Integer deliverInProgress = orderMapper.countStatus(Orders.DELIVERY_IN_PROGRESS);

        //将查询到的数据封装到orderStaticsVO中相应
        OrderStatisticsVO orderStatisticsVO = new OrderStatisticsVO();
        orderStatisticsVO.setToBeConfirmed(toBeConfirmed);
        orderStatisticsVO.setConfirmed(confirmed);
        orderStatisticsVO.setDeliveryInProgress(deliverInProgress);

        return orderStatisticsVO;

    }

    /**
     * 商家接单
     * 其实就是把订单状态修改为已接单状态
     *
     * @param ordersConfirmDTO
     */
    @Override
    public void confirm(OrdersConfirmDTO ordersConfirmDTO) {
        Orders confirmed = Orders.builder()
                .id(ordersConfirmDTO.getId())
                .status(Orders.CONFIRMED)
                .build();

        orderMapper.update(confirmed);
    }

    /**
     * 商家拒单
     * 商家拒单其实就是将订单状态修改为“已取消”
     * 只有订单处于“待接单”状态时可以执行拒单操作
     * 商家拒单时需要指定拒单原因
     * 商家拒单时，如果用户已经完成了支付，需要为用户退款
     *
     * @param ordersRejectionDTO
     */
    @Override
    public void rejection(OrdersRejectionDTO ordersRejectionDTO) throws Exception {
        //根据id查询订单
        Orders orderDB = orderMapper.getById(ordersRejectionDTO.getId());

        //订单存在并且订单状态为2(待接单)的状态下，商家才能够拒单
        if (orderDB == null && orderDB.getStatus() == Orders.TO_BE_CONFIRMED) {
            throw new OrderBusinessException(MessageConstant.ORDER_STATUS_ERROR);
        }

        //获取支付状态，如果已经支付，就需要进行退款操作
        Integer payStatus = orderDB.getPayStatus();
        if (payStatus == Orders.PAID) {
            //用户已经支付，需要进行退款
//            String refund = weChatPayUtil.refund(
//                    orderDB.getNumber(),
//                    orderDB.getNumber(),
//                    new BigDecimal(0.01),
//                    new BigDecimal(0.01));
            log.info("申请退款");
        }

        //拒单之后需要退款，根据订单id更新订单状态、拒单原因、取消时间
        Orders orders = new Orders();
        orders.setId(orderDB.getId());
        orders.setStatus(Orders.CANCELLED);
        orders.setRejectionReason(ordersRejectionDTO.getRejectionReason());
        orders.setCancelTime(LocalDateTime.now());
        orderMapper.update(orders);

    }

    /**
     * 派送订单
     * 派送订单其实就是将订单状态修改为“派送中”
     * 只有状态为“待派送”的订单可以执行派送订单操作
     *
     * @param id
     */
    @Override
    public void delivery(Long id) {
        //根据id查询订单
        Orders orderDB = orderMapper.getById(id);

        //校验订单是否存在，并且订单状态为3(已接单)
        if (orderDB == null && orderDB.getStatus().equals(Orders.CONFIRMED)) {
            throw new OrderBusinessException(MessageConstant.ORDER_STATUS_ERROR);
        }

        Orders orders = new Orders();
        orders.setId(orderDB.getId());
        //修改订单状态为派送中
        orders.setStatus(Orders.DELIVERY_IN_PROGRESS);
        orders.setDeliveryTime(LocalDateTime.now());
        //把订单状态更新到数据库中
        orderMapper.update(orders);

    }

    /**
     * 完成订单
     * 完成订单其实就是将订单状态修改为“已完成”
     * 只有状态为“派送中”的订单可以执行订单完成操作
     *
     * @param id
     */
    @Override
    public void complete(Long id) {
        //根据id查询订单
        Orders orderDB = orderMapper.getById(id);

        //校验订单是否存在，并且状态为4(派送中)
        if (orderDB == null && orderDB.getStatus().equals(Orders.DELIVERY_IN_PROGRESS)) {
            throw new OrderBusinessException(MessageConstant.ORDER_STATUS_ERROR);
        }

        Orders orders = new Orders();
        orders.setId(orderDB.getId());
        orders.setStatus(Orders.COMPLETED);
        orders.setDeliveryTime(LocalDateTime.now());

        orderMapper.update(orders);
    }

    @Override
    public void reminder(Long id) {
        //根据id查询订单
        Orders orderDB = orderMapper.getById(id);

        if (orderDB == null) {
            throw new OrderBusinessException(MessageConstant.ORDER_STATUS_ERROR);
        }

        //通过websocket向客户端浏览器推送消息 type orderId content
        Map<Object, Object> map = new HashMap<>();
        map.put("type",2);//1表示来单提醒 2表示客户催单
        map.put("orderId",id);
        map.put("content",orderDB.getNumber());
        String json = JSON.toJSONString(map);

        webSocketServer.sendToAllClient(json);

    }

    private List<OrderVO> getOrderVOList(Page<Orders> page) {
        //需返回订单菜品信息，自定义OrderVO返回结果
        List<OrderVO> orderVOList = new ArrayList<>();

        List<Orders> ordersList = page.getResult();
        if (!CollectionUtils.isEmpty(ordersList)) {
            for (Orders orders : ordersList) {
                //将共同字段复制到VO对象
                OrderVO orderVO = new OrderVO();
                BeanUtils.copyProperties(orders, orderVO);
                String orderDishes = getOrderDishStr(orders);

                //将订单菜品信息封装到orderVO中，并添加到orderVOlist
                orderVO.setOrderDishes(orderDishes);
                orderVOList.add(orderVO);
            }
        }
        return orderVOList;

    }

    /**
     * 根据订单id获取菜品信息字符串
     *
     * @param orders
     * @return
     */
    private String getOrderDishStr(Orders orders) {
        //查询订单菜品详情信息(订单中的菜品和数量)
        List<OrderDetail> orderDetailList = orderDetailMapper.getByOrderId(orders.getId());

        //将每一条订单信息拼接为字符串(格式为: 宫保鸡丁 * 3)
        List<String> orderDishList = orderDetailList.stream().map(x -> {
            String orderDish = x.getName() + "*" + x.getNumber() + ";";
            return orderDish;
        }).collect(Collectors.toList());

        // 将该订单对应的所有菜品信息拼接在一起
        return String.join("", orderDishList);

    }
}
